Bobbin



Nov. 4, 1958 K. M. MCLELLAN 2,859,000

BOBBIN Filed July 2'. 1954 SUPEPELEVA TED lnven tor NOE/ML K nneth M. MLeLLan, Srgoze 10 J22 2:222:25 BOLTON H His gtdioryegw United StatesPatent-O "BOBBIN Kenneth McLellan, Cleveland, Ohio, assignor to In-vdustrial Rayon Corporatiom...Cleveland, Ohio, at corporation of DelawareApplication'iluiy 2, 1954,'-Serial=No. 441,069

- 5 Claims. ,(Cl. 242125.2)

This invention relates to a flanged bobbin that is adapted to receive atransfer tail of yarn-woundabout one of its flanges.

Transfer tails areprovided onyarn packages so that thepackages can bedirectly employed in creeling operations, and for other purposes. -Atransfer tail eliminates the need for an intermediatepackage-reformation. Tr-ansfer tails, also known asmagazine wraps orpigtails, advantageously should be in a readilyaccessible place on abobbin yarn package. They are formed with a segment of an inner length of-yarn that is first wound 'into the of supply, ibis diflicult'toprovide transfer tails during collection. This is especially so sincethe yarn is being continuously suppliedat relatively rapidrates to abobbin, for example, in a cap twister or ring-twistertake-up assembly.In such instances it is impracticable to even momentarily discontinue ordecelerate-the rate of yarn supply sogas to allow a transfer tail to-bemanually formed or placed on the bobbin.

The present inventionadvantageously provides for a flanged, yarn packagesupporting bobbin adapted to receive in one of its flanges a transfertailof a yarn that is being wound on it. The bobbin of thepresentinvention can be utilized inringor cap twisting yarn take-up assemblies,and it is particularly adapted to the cap twisting yarn take-upassemblies having anincorporated transfer tail forming means similartothat disclosed and claimed in the applicants co-pending application,Serial No. 434,724, filed on June 7, 1954, now Patent No. 2,787,112.

In accordance with the presentinvention a flanged, yarn packagesupporting bobbin has a peripheral groove-in its lower flange forreceiving and supporting'a transfer tail of yarn being collected on thebobbin. The groove forms inner and outer walls on the circumference ofthe lower bobbin flange which separate the respective inner and outerfaces of the flange from the groove. The inner wall is cut away to thedepth of the groove for asubstantial portion of its periphery. The cutaway portion of 'the inner wall picks up theyarn being wound on thebobbin to direct it to the groove Whenever an inner length of an end ofyarn beingflrst wound on the-bobbin is guided or moved out over thelower flange of the bobbin. One or more wraps of yarn may thus be woundin the groove on the flange to provide a transfer tail. The end of yarnis then returned through the cut away portion of the inner wall'to bewound on the bobbin. A notch also is provided on the circumference ofthe lower flange through the outer wall to facilitate removal of yarn.wound in the groove. In addition, counterweighting means areadvantageously provided on the bobbin to dynamically balance it duringrotation.

-Patented Nov. 4, 1958 '2 Further advantages will become apparent in thefollowing description and 'the accompanyingxidrawing .in which likereference numerals refer to like. parts, Wherein:

Figure 1 is a perspective view, partly in section, of a bobbininaccordance with'the present invention supporting a yarn package having atransfer tail,

Figure 2 is a fragmentary 'front elevation of part of the bobbin showingthe peripherally grooved and recessed lower flange,

Figure 3 is a sectional view of the lower bobbin flange and part of theyarn core taken along the line"3,- -3 in Figure 4,

Figure 4 is a plan view; partly insection, of the lower bobbin flange onthe yarn core,

Figure 5 is a fr-agmentary-jsectional view of the lower bobbin flangeenlarged from Figure 4 to show several up apparatus.

With reference to the first fivefigures' of the drawing, and initiallyto Figure 1, there is illustrateda bobbin supporting a yarnpackageyindicated generally by the numeral 10. Thelayersofyarn wound. onthe bobbin are cut-back and shown partly in section. The bobbincomprises a core 11, an upper flange 12, and a base or lower flange,indicated generally by the reference numeral 13. The package supportedon -the bobbin is formed according to conventional practice by windingan end -of yarn -16 on the bobbin core llgbetween the upper and lowerflanges 12 and 15, in successive layers of yarn"17. The lowerflange 13of the bobbin, 'more specifically shown in Figures 2 and 3, isprovidedwith a peripheral groove 18. The groove 18 in the flange periphery formsan inner wall 19 and an outer wall'20, both encircling the flange. Theinner wall 19, located onthe same side of the lower flange 13 as the'core 11,- separates the inner face 14 of the flange 13, which abutsyarn Wound in the bobbin, from the groove" '18. "The outer wall 20separates the outer face 15 of the flange 13, at the lower endofthebobbin,-fromthe groove 18.

Preferably, the groove 18 is poistioned more towards the inner-face 14of the flange 13'from its interfacial center plane-to provide for arelatively .thinner .inner wall 19 in comparision to the outer Wall20.Thisis' desirable to avoid a hang-up of the yarn during its transferfrom the core 11 to the groove '18 and'ba'ck again or while it isbeing'wound in the groove to provide a transfer tail. As morespecifically shown in Figures 2 and 3, the inner Wall 19 isadvantageously rounded and smooth along its outer circumferential edgeportion. Flat spots, roughnesses or other surface irregularities on theouter circumference of the inner wall 19 tend to impart loops to theyarn while it is being wound in the groove 18.

The inner wall 19 is cut away tothe depth of the groove 18 for asubstantial portion of its periphery, as illustrated by the angle a inFigure 4. Advantageously, the cut away portion, indicated by referencenumeral 21, forming the angle a may extend forbetween about 60 and about120 .along .the flange .circumference, .and preferably, for bestoperation, about of the inner wall is cut away. As illustrated in Figure2, it is. desirable for the inner wall 19 to be taperedand. roundedsmooth at the edges of the cut-away-21. Such. construction assistsmaterially in the pick-up ofyarnwhen itris guided over the flange to bewound into the groove. Also, it permits the smooth return of the yarnfrom the groove to the core after the transfer tail has been formed.

Further, a notch 22 is advantageously provided on the circumference ofthe lower flange between the outer face 15 of the flange 13 and thegroove 18 in its periphery. As shown in Figure 5 the notch 22 is cutinto the flange 13 slightly deeper than the groove 18. It is positionedon the circumference of the flange about opposite the cutaway 21 in theinner wall 19. More specifically, it is positioned about opposite thecenter of the cut-away. The notch 22 is useful for permitting an easyrelease of yarn wound as a transfer tail in the groove by allowing forready access thereto. Scissors or other suitable instruments may beinserted in the notch 22 to cut the yarn 16 and thus release it as atransfer tail. Or, if transfer tails of longer length are desired, ahook or other instrument inserted in the notch 22 may be employed tocatch one or more wraps of the yarn 16 and pull it out of the grooveover the outer wall 20. The wraps of yarn so released may then be cut topresent the transfer tail on extending the yarn.

Advantageously the bobbin may be dynamically balanced to minimizevibrations and the like when it is being rotated at a collection or yarntake-up speed. Such speeds, in certain take-up apparatus, such as captwisters, may be as great as 8,000 revolutions or more per minute. Acentrifugally unbalanced bobbin may cause vibration, poor performanceand excessive wear or even damage when it is rotated at a relativelyhigh rate. weighting means for balancing may be included in the bobbin.Conveniently these are located in its lower flange.

For example, a counterweighting effect may be provided by a balance hole23 bored in the outer face 15 of the lower flange 13 across from thecut-away 21. This counterbalances the flange and countereffectsunbalance which might result from the cut-away 21 in the inner wall 19and the notch 22. Other counterweighing means such as weights and thelike may also be employed for the bobbin.

A transfer tail for a yarn package supported on a bobbin in accordancewith the present invention may be formed in various ways duringcollection of the yarn without interrupting the rotation of the bobbinduring the take-up period in which the package is formed. The transfertail is wound in the peripheral groove 18 of the flange 13 by guiding ordirecting an inner length of an end of yarn being first wound in thebobbin out over the lower flange. The cut away portion 21 of the innerwall 19 picks up the yarn and directs it to the groove 18 wherein atleast one turn or wrap, preferably several, is wound to provide atransfer tail. After a desired amount of yarn has been wound in thegroove 18, the yarn is guided or directed back onto the core 11 betweenthe bobbin flanges 12 and 13 through the recess. The package may then bewound in a normal manner.

The guiding of the yarn 16 outwardly from the bobbin 10 over the lowerflange and into the groove is preferably done as soon as possible afterthe yarn is thrownon the core according to normal techniques and thecollection has been started. It may, for this purpose, be manuallyguided or directed thereinto. More desirably, however, the bobbin 10 isemployed in a takeup apparatus which is adapted to momentarily guide andhandle the yarn in such a desired manner. For example, in a ring twisterthe ring guide may momentarily be brought down over the flange 13 forone or several rotations. Or the bobbin 10 may momentarily be liftedupward for the same purpose. Similar and analogous methods employed in acap twister will accomplish like results. I

Advantageously, the bobbin 10 is employed in a cap twister apparatuswhich is adapted to momentarily additionally extend the bobbin for morethan a normal upward stroke in the cap. In other words, the bobbin isCountersuperelevated on an upward stroke within the cap to bring thelower flange 13 up in the cap. The end of yarn is then picked up by thecut away portion 21 of the inner'wall 19 on the flange 13 to wind one ormore wraps as a transfer tail in the groove 18.

Figures 6 and 7 illustrate the effect of superelevating the bobbin 10 ina cap to form a transfer tail wound in the groove 18. Figure 6 depictsthe normal vertically reciprocating stroke of the bobbin 10 within a cap24. At the top of a normal stroke the whole of the bobbin 10 exceptingthe lower flange 13 is up within the cap 24 leaving sufiicient clearancebetween the inner face 14 of the lower flange 13 and the lower yarnguiding circumference of the cap 24 for the end of yarn 16 to betaken-up on the bobbin core 11. At the bottom of a normal stroke thebobbin is in a position depicted by the dotted lines. The inner face ofthe upper flange 12 of the bobbin is about even with the lower guidingcircumference of the cap 24. The bobbin 10 thus takes up the yarn 16 upto against the inner face of the upper flange 12. In Figure 7, a part ofthe lower flange 13 of the bobbin 10 is brought up within the cap 24 atthe top of a superelevated upward stroke of the bobbin. This permits thecut-away 21 to pick up the yarn 16 and to cause it to be wound for oneor more turns of the bobbin in the peripheral groove 18 of the lowerflange 13. When the bobbin is returned to a normal stroke from asuperelevated position, the yarn 16 passes out of the groove 18 throughthe opposite side of the cut-away 21 from which it was picked up. Itthen is Wound in a normal manner on the core 11 between the flanges 12and 13 to form a yarn package which has thus been provided with atransfer tail.

A relatively wide cut away portion in the inner wall of a lower bobbinflange in accordance with the present invention provides for manyadvantages. A bobbin having such a construction is well adapted foremployment with take-up apparatus of the cap-twister variety which canbe provided with a bobbin superelevating means as heretofore explained.This is particularly so when the take-up apparatus winds the yarn on thebobbin through a relatively slow traverse and the yarn is being laid onthe bobbin core at a relatively smaller pitch or degree of helicaladvance. A narrower cut-away cannot be continually relied upon toproperly pick up slightly pitched yarn or to return it for winding onthe bobbin core after the transfer tail has been wound in the groove.

Further, the substantial cut away portion of the inner wall permits forready and convenient identification of the inlet and outlet segments ofthe transfer tail in the groove. For example, if a bobbin is rotatedcounterclockwise the inlet segment or inner end of the yarn alwayspasses through the cut-away at its right side, when looking down on thebobbin from above its upper flange. The outlet segment is then, ofcourse, on the left side. The inlet and outlet segments of the transfertail are thus readily distinguishable. The converse is true when thebobbin has been rotated clockwise during collection. It is of advantageto be able to distinguish the inlet and outlet segments in such arelatively simple manner. Proper identification may avoid an inadvertentseverance of a wrong portion of the transfer tail which might result inits being effectively destroyed.

Since certain changes in the practice of this invention may obviously bemade without departing from its spirit or scope, it is to be understoodthat all of the foregoing description be interpreted and considered asmerely illustrative and in no sense limiting of the invention, asparticularly pointed out and defined in the appended claims.

What is claimed is:

1. In a flanged bobbin adapted to receive, as a transfer tail, on theperiphery of one of its flanges a portion of yarn being initially woundon said bobbin; a pcripheral yarn receiving groove in a flange of saidbobbin; ,and a wall encircling said flange separating said groove andthe inner face of said flange, said wall being cut away about to thedepth of said groove for between about 60 and about 120 of itsperiphery.

27 In a flanged bobbin adapted to receive, as a transfer tail, on theperiphery of one of its flanges a portion a portion of yarn beinginitially wound on said bobbin; a peripheral yarn receiving groove in aflange of said bobbin; inner and outer walls encircling said flangeseparating said groove from the inner and outer faces respectively ofsaid flange, said inner wall being cut away about to the depth of saidgroove for between about 60 and about 120 of its periphery; and a notchon the circumference of said flange extending through said outer walland communicating between saidgroove and the outer face of said flange.

3. In a bobbin according to claim 2 wherein said inner wall is cut awayfor about 90 of its periphery and wherein said notch ispositioned on thecircumference of said lower flange about opposite the cut away portionof said inner wall.

4. In a flanged bobbin adapted to receive, as a transfer tail on theperiphery of one of its flanges a portion of yarn being initially woundon said bobbin; a peripheral yarn receiving groove in a flange of saidbobbin; inner and outer walls encircling said flange separating saidgroove from the inner and outer faces respectively of said flange, saidinner wall being cut away about to the depth of said groove for betweenabout 60 and about 120 of its periphery, said inner wall being thinnerthan said outer wall and being rounded along its outer edge and taperedrounded at its cut away portion; and a notch on the circumference ofsaid flange about opposite the cut away portion of said inner wall, saidnotch being deeper in said flange than said groove and extending throughsaid outer wall and communicating between said groove and the outer faceof said flange.

5. In a flanged bobbin adapted to receive, as a transfer tail, on theperiphery of one of its flanges a portion of yarn being initially woundon said bobbin; a peripheral yarn receiving groove in a flange of saidbobbin; inner and outer walls encircling said flange separating saidgroove from the inner and outer faces respectively of said flange, saidinner wall being cut away about to the depth of said groove for betweenabout and about of its periphery, said inner wall being thinner thansaid outer wall and being r ounded along its outer edge and taperedrounded at its cut away portion; a notch on the circumference of saidflange about opposite the cut away portion of said inner wall, saidnotch being deeper in said flange than said groove and extending throughsaid outer wall and communicating between said groove and the outer faceof said flange; and counterweighting means on said flange fordynamically balancing said bobbin during rotation.

References Cited in the file of this patent UNlTED STATES PATENTS1,881,383 Wylie Oct. 4, 1932 2,298,357 Elvin et a1. Oct. 13, 1942

